Coriolis mass flowmeter with an oscillatable straight measuring tube

Abstract

The disclosure relates to a Coriolis mass flowmeter with an oscillatable straight measuring tube consisting of a corrosion-resistant metal, in particular of titanium or a titanium alloy, to which are attached mounted parts connected directly to the measuring tube for the implementation of the Coriolis measurement principle. Furthermore, stabilizing elements running parallel to the measuring tube are coupled to the measuring tube via mounted parts connected directly to the measuring tube, the mounted parts and the stabilizing elements consisting of a metal other than that of the measuring tube. The stabilizing elements are manufactured from a second material which possesses a coefficient of thermal expansion adapted to the metal of the measuring tube. The mounted parts connected directly to the measuring tube are manufactured from a third material which possesses a higher coefficient of thermal expansion than the metal of the measuring tube.

1. A Coriolis mass flowmeter, comprising:
 an oscillatable straight measuring tube consisting of titanium or a titanium alloy, to which are attached mounted parts connected directly to the measuring tube for the implementation of the Coriolis measurement principle and to which at least one rigid stabilizing element running parallel to the measuring tube is coupled via mounted parts connected directly to the measuring tube, wherein the at least one stabilizing element is manufactured from a material which possesses a coefficient of thermal expansion which deviates from the coefficient of thermal expansion of the measuring tube by no more than 20%, and 
 wherein the mounted parts connected directly to the measuring tube comprise at least one of end plates, a balancing element, a carrier part, and a connecting element, and are manufactured from a material which possesses a higher coefficient of thermal expansion than the metal of the measuring tube. 
 
     
     
       2. The Coriolis mass flowmeter as claimed in  claim 1 , wherein at least two stabilizing elements run parallel to the measuring tube and, expanded in the axial direction of the measuring tube, are coupled to the measuring tube at a plurality of locations via mounted parts connected directly to the measuring tube. 
     
     
       3. The Coriolis mass flowmeter as claimed in  claim 2 , wherein the stabilizing elements are arranged opposite one another on both sides of the measuring tube. 
     
     
       4. The Coriolis mass flowmeter as claimed in  claim 3 , wherein the at least one stabilizing element consists of hollow material. 
     
     
       5. The Coriolis mass flowmeter as claimed in  claim 2 , wherein the at least two stabilizing elements are manufactured from a ferritic high-grade steel. 
     
     
       6. The Coriolis mass flowmeter as claimed in  claim 2 , wherein the at least two stabilizing elements are connected to the measuring tube via end plates. 
     
     
       7. The Coriolis mass flowmeter as claimed in  claim 1 , wherein the at least one stabilizing element is manufactured from a ferritic high-grade steel. 
     
     
       8. The Coriolis mass flowmeter as claimed in  claim 7 , wherein the mounted parts are manufactured from an austenitic high-grade steel. 
     
     
       9. The Coriolis mass flowmeter as claimed in  claim 1 , wherein the mounted parts are manufactured from an austenitic high-grade steel. 
     
     
       10. The Coriolis mass flowmeter as claimed in  claim 1 , wherein the mounted parts are connected to the measuring tube or to one another by at least one of brazing and welding. 
     
     
       11. The Coriolis mass flowmeter as claimed in  claim 1 , wherein the at least one stabilizing element has a rectangular, square, circular or elliptic cross section. 
     
     
       12. The Coriolis mass flowmeter as claimed in  claim 1 , wherein the at least one stabilizing element is connected to the measuring tube via end plates. 
     
     
       13. The Coriolis mass flowmeter as claimed in  claim 12 , wherein at least one balancing element for setting the oscillation behavior is arranged on the measuring tube between the end plates. 
     
     
       14. A Coriolis mass flowmeter comprising:
 an oscillatable straight measuring tube formed of a first material based on a corrosion-resistant metal; 
 mounted parts connected to the measuring tube for implementation of Coriolis measurement; and 
 a rigid stabilizing element disposed parallel to the measuring tube to be coupled via mounted parts, wherein the stabilizing element is formed of a second material having a coefficient of thermal expansion which deviates from the coefficient of thermal expansion of the measuring tube by no more than 20%, and 
 wherein the mounted parts connected to the measuring tube comprise at least one of end plates, a balancing element, a carrier part, and a connecting element, and are manufactured from a material which possesses a higher coefficient of thermal expansion than the metal of the measuring tube. 
 
     
     
       15. The Coriolis mass flowmeter as claimed in  claim 14 , wherein the straight measuring tube consists of titanium or a titanium alloy.